Marine Installation Manual 2021-08 4-7
4 Ancillary Systems
4.2 Cooling water system
X72DF
Arrangement 3
The central freshwater cooling system is separated into two dedicated cooling
circuits to better manage the varying temperature set-points. This includes:
• Circuit 1:
The ME SAC is cooled with freshwater with a temperature set-point of
25 °C (WinGD specification). With this arrangement, only the ME SAC re-
quires maximum design seawater flow for cooling.
• Circuit 2:
All other ME and ancillary plant coolers are cooled with freshwater with a
set-point customised by the shipyard or ship designer.
Figure 4-5 is a proposal only and the seawater pump and other equipment layout
might be different. As such, the shipyard is free to design their own seawater
system. However, the set-point temperature for the ME SAC must be 25 °C as per
WinGD specifications.
Figure 4-5 Separate SAC and LT cooling circuits
SM-0303
Main
Engine
4 (set-point 25
°C)
7
5
6
8
SAC
4 (set-point:
customised by S/Y)
1
1 Scavenge air cooler (SAC)
2 CW pumps for SAC
3 Central seawater cooler
4 Automatic temp. control valves
5 Ancillary plants
6 Lubricating oil cooler (LOC)
7 HT Cylinder cooling water cooler (CCWC)
8 CW pumps for ancillary plants, LOC and CCWC
9 Seawater circulating pump
10 Seawater circulating pump with freq. controller
3
9
2
3
10
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